Rename SettingValue to Setting. (#286)

Breaking change, but the crate is fresh and there's time to yank and
republish.

src/piv.rs

@@ -48,7 +48,7 @@ use crate::{
     error::{Error, Result},
     policy::{PinPolicy, TouchPolicy},
     serialization::*,
-    settings,
+    setting,
     yubikey::YubiKey,
     Buffer, ObjectId,
 };
@@ -481,7 +481,7 @@ pub fn generate(
     const SZ_ROCA_BLOCK_ADMIN: &str = "was blocked due to an administrator configuration setting.";
     const SZ_ROCA_DEFAULT: &str = "was permitted by default, but is not recommended.  The default behavior will change in a future Yubico release.";
 
-    let setting_roca: settings::SettingValue;
+    let setting_roca: setting::Setting;
 
     match algorithm {
         AlgorithmId::Rsa1024 | AlgorithmId::Rsa2048 => {
@@ -489,17 +489,17 @@ pub fn generate(
                 && (yubikey.version.minor < 3
                     || yubikey.version.minor == 3 && (yubikey.version.patch < 5))
             {
-                setting_roca = settings::SettingValue::get(SZ_SETTING_ROCA, true);
+                setting_roca = setting::Setting::get(SZ_SETTING_ROCA, true);
 
                 let psz_msg = match setting_roca.source {
-                    settings::SettingSource::User => {
+                    setting::SettingSource::User => {
                         if setting_roca.value {
                             SZ_ROCA_ALLOW_USER
                         } else {
                             SZ_ROCA_BLOCK_USER
                         }
                     }
-                    settings::SettingSource::Admin => {
+                    setting::SettingSource::Admin => {
                         if setting_roca.value {
                             SZ_ROCA_ALLOW_ADMIN
                         } else {